Blueair Classic 203 Slim HEPASilent Air Purification System, Allergy, Hay Fever and Dust Reducer, Small Rooms 237 sq. ft., White Battle allergies, asthma and hay fever with True HEPA performance, enabled by HEPASilent Technology with particle filtration and electrostatic charge, captures 99.97% of airborne pollutants; allergens, mold, dust, pet dander, smoke particles and pollen Energy Star air purifier with certified Clean Air Delivery Rate (CADR) of 155 cubic feet per minute with a superior, 5 air changes per hour Ozone Reducing - HEPASilent filtration air cleaner system, 3 fan speeds and whisper quiet operation for use in kids rooms, nurseries or offices SmokeStop filter with activated carbon for removal of odors caused by smoke, pets, food, and VOCs (sold separately) For small to medium rooms between 200 sq. ft. and 300 sq. ft. AHAM rated at 237 sq. ft. Recommended to replace filters every 6 months depending on use Energy star rated for best in class energy performance. All filters are recyclable and suggested to be replaced every 6 months depending on use